134-2001 Regulations for energy-saving design standards for residential buildings in hot summer and cold winter areas: Residential buildings should achieve energy-saving 50% by adopting energy-saving measures to enhance the insulation performance of building envelopes and improve the energy ratio of heating and air-conditioning equipment. The development and development of a variety of energy-saving building materials are constantly emerging. For buildings, the most important thing is to strengthen the insulation treatment of the envelope structure. The main measure is to carry out the necessary insulation measures in accordance with national energy-saving standards on the external walls and roof parts. In combination with the actual situation in the local area, although most of the existing residential communities are frame structure buildings, most of the external protection structures are used in the old method: the walls are made of hollow bricks, and the inner and outer layers are each coated with 20mm thick mixed mortar, and the total heat transfer coefficient is K. =1.873WV (m2K), the outer wall does not have insulation layer, which makes the thermal insulation performance of the outer wall poor, and can not meet the national energy-saving requirements. Due to the simple operation and economical application of mortar insulation materials, it has been widely used by real estate developers. According to the majority of local engineering external walls, the cement-based composite thermal insulation mortar building insulation system is used to briefly introduce the performance, process and quality control measures of the material. .
1 Project example Guangyuan Century Garden is a large residential area in Jiangdu, with a total construction area of ​​more than 200,000 m2 consisting of small high-rise, multi-storey residential projects and public buildings in the community. The design unit is designed according to the current national and provincial energy-saving standards: 1) Some flat roof insulation is insulated and extruded. 2) The exterior doors and windows are made of plastic steel doors and windows and insulating glass, and partially hollow tempered glass is used according to relevant standards. 3) The external thermal insulation of the wall is made of cement-based composite thermal insulation mortar building insulation system.
2 The cement-based polystyrene particle exterior insulation system structure (see Table 1) becomes the thermal environment inside the heating hood. Assuming that the heat loss caused by the addition of the heating hood is 67W, ignoring other influencing factors, the standard heat of 1,678 is required to pay 1754WA of heat and 120% of relative flow. This means getting a comfortable room temperature. Hot users will have to increase the set temperature of the thermostat inside the heating hood and pay an economical cost for excess heat loss. In addition, the installation of a heating cover brings a lot of inconvenience to the maintenance of the radiator.
4 The reasonable setting of the heating cover is in the home decoration. In order to ensure the overall harmony of the room, it is very common to install the radiator cover on the radiator. According to the relevant analysis data, 8%~30% of the heat is not emitted after the heating cover is installed, so the households who add the heating cover will consume more heat, and the heating cost is high. Therefore, a reasonable heating cover setting has a positive meaning. American W'H. Carrier has pointed out that from the point of view of heat dissipation, the air inlet with grille should have a clearance area at least equal to the clearance area when air passes through the heat dissipating component, and the grille without grille It should exceed 25% of this area. For the air outlet, it should not be less than 0.9 times the clearance area of ​​the air through the heat dissipating component. The design of the air outlet direction of the heating cover not larger than this area is a problem that has a great influence in practical applications. Although the upward direction is conducive to heat dissipation, this design not only makes it easy for the heat dissipating component to accumulate dust, but also the long-term use causes the hot air to carry various particles to pollute the wall of the air outlet port, and at the same time, the air port upward is not conducive to the improvement of the comfort condition of the living space, and thus the sanitary And the health point of view should be that the air outlet should be placed forward.
5 Conclusion The radiator and cover are an integral part of the architectural design. As far as architectural decoration is concerned, the heating hood is not only used to meet the needs of the building itself, but more importantly, it is used to meet people's living and environmental needs. Therefore, attention should be paid to the cooperation between the two in design and construction. . If the heating cover is not properly implemented, it will directly affect the heat dissipation effect of the radiator, reduce the indoor temperature, and waste a lot of heat. Therefore, the role of the heating hood in saving energy cannot be ignored.
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